Hui women in Ningxia mountainous areas like kouxian, which is a small musical instrument that is played by the mouth, including bamboo and iron. Bamboo is 3 inches long, and it is played by pulling the line. Made of iron, about one and a half inches long, the hook spring is plucked by hand, and the hook spring in the middle vibrates inside and outside, and the mouth is used for ringing the box and the oral cavity is used to adjust the change of sound to form a scale. Girls use this simple and compact musical instrument to express their feelings, play songs and enrich their cultural life.